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I had this same issue - board would not turn on, but powered up and communicated via Bluetooth fine when plugged in, showed 00% charge, adapter light stayed green, would not charge.
I tried a lot of different things, tried pushing power button while board was plugged in, did nothing. Tried removing access panel to get to battery wire harness, unplugged it, tried drying it out since it was wet outside, didn't work.
Then I plugged the board in for 48 hours straight and then pushed the power button while the board was still plugged in, adapter flashed red momentarily, then battery power showed 100%. Board then powered on when unplugged with no issue. This is a strange one.